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21 cm Searches for Dim Galaxies

Published online by Cambridge University Press:  05 March 2013

Mike Disney  and
Gareth Banks
Mike Disney
Affiliation:
University of Wales College of Cardiff, PO Box 913, Cardiff CF2 5YB, UK; mjd@astro.cf.ac.uk
Gareth Banks
Affiliation:
University of Wales College of Cardiff, PO Box 913, Cardiff CF2 5YB, UK; gdb@astro.cf.ac.uk Australia Telescope National Facility, CSIRO, PO Box 76, Epping 2121, Australia
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Abstract

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We review very strong selection effects which operate against the detection of dim (i.e. low surface brightness) galaxies. The Parkes multibeam instrument offers a wonderful opportunity to turn up new populations of such galaxies. However, to explore the newly accessible parameter space, it will be necessary to survey both a very deep patch (105 s/pointing, limiting Nhi ∼ 1018 cm−2) and a deep patch (104 s/pointing, limiting Nhi ∼ 3 × 1018 cm−2) in carefully selected areas, and we outline the case to do this.

Keywords

galaxies: generalgalaxies: luminosity functiongalaxies: mass functiongalaxies: statistics
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 14 , Issue 1 , 1997 , pp. 69 - 72
Copyright
Copyright © Astronomical Society of Australia 1997

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